Improvement in telegraph-poles



J. & J. McDERMOTT.

Telegraph Pole.

No. 220,029. Patented Sept. 30,1879.

UNITED STATES PATENT OFFICE.

JOHN MGDERMOTT AND JAMES MGDERMOTT, OF WASHINGTON, D. O.

IMPROVEMENT IN TELEGRAPH-POLES.

Specification forming part of Letters Patent No. 220,029, datedSeptember 30, 1879.; application filed 7 October 10, 1878.

To all whom it may concern.-

Be it known that we, JOHN MODERMOTT and JAMES MCDERMOTT, of the city ofWashington and District of Columbia, have invented a new and usefulImprovement in Tubular Metallic Telegraph-Poles, of which the followingis a specification, reference being had to the accompanying drawings, inwhich- Figure 1 is a view in perspective. Fig. 2 is a verticallongitudinal section. Fig. 3 is a view showing the ladder attached. Fig.4 is a view of our portable flexible ladder with pole attached, forplacing the hooks of the ladder over the round or cross-piece near thetop of the pole.

The object of our invention is to construct a telegraph-pole in a cheapand durable manner; and it consists in making the poles of iron tubes,provided with a shouldered wooden plug inserted in the upper end of thetube, which extends a short distance above the top of the tube, and theupper end of which is screw-threaded, so as to readily receive theordinary glass insulator.

It further consists in placing a short iron bar through the tube a shortdistance from its top, for the purpose of affording a foot-support forparties in attaching the wire to the insulator or repairing the same,and to support the ladder.

It further consists of a flexible ladder having segmental braces to holdthe ladder out from the pole. and for securing the same, and a rigid orsectional pole for lifting and placing the hooks of the ladder onto theround or cross-piece, to allow constructing and repairing parties toascend and descend the pole.

Referring to the drawings, A is an iron tube of any desired length. B isthe wooden plug, to which the ordinary insulator is attached. This plugB is inserted in the top end of the pole to the extent of about sixinches, where it is secured by a galvanized-iron nail, which is insertedthrough a perforation in the tube A. A-shoulder, a, on the wooden plugallows it to enter the tube just so far, and the shoulder or projectingedge prevents the entrance of rain and protects that portion of the plugin the tube. The upper portion of the wooden plug is tapered off, and isprovided with a screw-thread, by which means the ordinary glassinsulator is attached.

About four feet from the top of the pole or tube we make a hole fromone-half to threefourths of an inch in diameter. This perforation passesdirectly through the tube at right angles to its length, and into it isplaced a short iron bar, 0, which serves as a rest or support for theconstructer or repairer, and for the ladder.

D is a flexible ladder, the sides of which may be made of wire or hemprope, and capable of being folded up compactly and carried convenientlyfrom place to place. The upper portion of the ladder consists of a rigidframework, E, the upper bent or jointed sides of which terminate inhooks, which are designed to engage with the cross-bar 0. To the lowercentral portion of the frame-work E a short bifurcated segmental braceor support, F, is secured, which is designed to partly embrace the poleand hold the upper portion of the ladder away from it. A brace, F,similar to brace F, is attached to the second round from the bottom forthe same purpose. To the central portion of the lower round of theladder is attached a brace or support, G, which differs from the brace Fin that its outer end terminates in a hinged band or ring, H, whichembraces the pole, and is provided with a thumbscrew, I, by which it isfirmly secured to the pole.

J is a rigid or sectional pole, made square at the top to enter a squarehole in the frame E, and by the use of Which the operator places thehooks of the ladder on orover the'iron bar 0. When the hooks of theladder have been placed over the iron bar and the brace or support F haspartially embracedthe pole, the hinged ring on the brace Gr is caused toencircle the pole. The ladder is then made taut by pressure from thefoot of theoperator, and by means of the thumb-screw it is made fast. Bythis means we have a rigid, reliable, and substantial ladder.

The pole or tube A is set in the ground about three feet and in order toprotect the same from rust, We dip the lower end of the tube in coal-taror asphaltum, which forms a protecting coat, excluding all moisture.

In combination with the pole A, provided with the cross-bar G, theflexible ladder D, having the frame E, stays or supports F, hinged stayG, and thumb-screw I, when constructed and arranged in the manner setforth, and for the purpose specified.

JOHN MGDERMOTT. JAMES MGDERMOTT.

Witnesses 1. F. RILEY, A. REYNOLDS.

